The whole debate about banning motorbikes has never been about "when" but about whether it will be a good solution to existing problems.
Most importantly, change needs to happen gradually or lives will be turned upside down overnight.
I don't like using the word "ban" because riding motorbikes is not something illegal. Telling people to give up their motorbikes while still allowing them to be sold and without any imposing restrictions on motorbike manufacturers is lunacy.
How can motorbikes be banned if there is no real replacement for them? Will there be enough parking space for all cars? Even if there is, cars are way more expensive to buy in Vietnam than in other countries. How can the general populace gain access to cars in the first place then?
I haven't even mentioned the abysmal quality of public transport here. I haven't seen any kind of quality evaluation for them; most public transport service providers here are left to their own devices. It means their passengers are left to fend for themselves.
There are so many more things I can write to prove that banning motorbikes would be extremely, unfathomably difficult to achieve in Vietnam. It is a wishful thought that will forever remain on paper.